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20 June 1995 Figure of merit for underwater object distortion
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A major obstacle to target detection by airborne electro-optic systems in the shallow water environment is distortion due to wave action from the sea surface air-to-water interface. This problem is being studied by the Program Executive Office Mine Warfare (PMO-210) through an ongoing project called Magic Lantern Adaptation. Under funding from this program, a pier test has been planned to collect data to help understand and model the warping effects of the air-to-water interface. To measure the amount of distortion occurring from wave action, a figure of merit was developed by a fuzzy 'ANDing' of 1) a scale and bias invariant normalized correlation, 2) the ratio of signal power to local noise power, and 3) the ratio of signal strength to overall image background variance. Results show that the figure of merit can successfully evaluate the 'goodness' of target distortion. On a scale from 0 to 100, with 100 indicating no distortion, 'good' targets were measured in the 70s, 'fair' targets in the 50s, and 'poor' targets in the 20s and 30s. The choice of scale and bias invariant correlation was derived after evaluating the problems encountered with standard and scale invariant correlation techniques. This paper contains a discussion of this evaluation.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrew J. Nevis and Gerald J. Dobeck "Figure of merit for underwater object distortion", Proc. SPIE 2496, Detection Technologies for Mines and Minelike Targets, (20 June 1995);

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